I recently bought a new site from a seller who transferred the domain to my a/c and mailed me the related files for hosting.
I need help in setting up that site. I am not sure where to transfer those files to set up the site and make it working.
The seller is asking for extra money to transfer the contents.

its a wordpress blog
you just need a hosting account to upload your files and import the sql
you might also require the old wordpress password in order to login
let me know if you face any problem I can help you out with that

yep if you use cpanel hosting
upload all this file to the main folder for this domain , open wp-config.php and find the user, password and the DB name
create them in cpanel
after that open phpmyadmin and import tho this db the sql file

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